Enhancing the adsorptive capacity of carbon nanofibers by impregnation with ferric oxide for the removal of cadmium from aqueous solution

Oyehan, Tajudeen A.; Laoui, Tahar; Tawabini, Bassam; Patel, Faheemuddin; Olabemiwo, Fatai A.; Atieh, Muataz Ali

doi:10.1016/j.jwpe.2021.102130

Cited by 8 publications

(2 citation statements)

References 48 publications

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“…In this study, we used Conical Carbon Nanofibers (CCNFs) supplied by Hebei Liche Zhuoge Environmental Technology Co., Ltd, selected for their exceptional purity of 99.99%. Their effectiveness has been demonstrated in previous studies [35], [36] and further documented in additional academic articles [37], [38], [39]. These CCNFs featured diameters ranging from 75 to 25 nm and lengths between 20 to 30 m. The study also used MWCNTs (Multi-Walled Carbon Nanotubes) sourced from Sigma Aldrich, characterized by a minimal trace metal presence below 2000ppm, with average and outer diameters of 8.7 nm and 6.0 nm respectively, lengths from 2.5 to 20µm, an inner diameter of 2.0 nm, and a purity of 98.99%.…”

Section: Materials and Chemicalssupporting

confidence: 52%

“…The materials were then dried overnight at 80 • C. This acid wash process significantly improved the adsorptive surface area of both the CNTs and CNFs. While the synthesis of nanocomposites through the integration of carbon nanostructures and metal oxides has been described by Asmaly H., Gouda, Natrayan, and Atieh, as cited in references [32], [37], [38], [39]. The synthesis of CNAs /Al 2 O 3 started by mixing 100mg each of CNTs and CNFs in 50ml centrifuge tubes, ensuring an even distribution of the carbon nano adsorbents using a vortex mixer.…”

Section: Synthesis Of (Cnas/ Al 2 O 3 )mentioning

confidence: 99%

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Optimizing 2-Nitrophenol and Chromium Adsorption from Water with Aluminium Oxide via Response Surface Methodology

Asmaly,

Kabbashi,

Al-Khatib

et al. 2024

Kbes

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The study explored the efficacy of an innovative adsorbent crafted from carbon nanotubes and carbon nano fibbers integrated with aluminium oxide, in purging water solutions of both organic (2-Nitrophenol) and inorganic (Chromium III) contaminants. The study refined the aluminium impregnation method to boost the adsorption efficiency of CNAs/Al2O3 in removing certain pollutants. Through a central composite design (CCD) strategy, optimal adsorption conditions were determined. The most effective removal of 2-NPh (2-Nitrophenol) and Cr3+ (Chromium III) occurred with CNAs/Al2O3 at an 18% impregnation ratio, after 3 hours of ultrasonication and calcination Temperature at 300 oC. This technique yielded adsorption capacities of 82.02 mg/g for 2-NPh and 96.57 mg/g for Cr3+. The aluminium content in the adsorbents, prepared under these specified conditions, was verified, and measured using EDX (Energy Dispersive X-ray) analysis. Further, BET (Brunauer-Emmett-Teller) measurements revealed the impact of aluminium ratios on the surface area of CNAs/Al2O3, where an 18 % aluminium ratio led to a surface area of 176 m2/g, diminishing to 125 m2/g and 110 m2/g for 20% and 22% aluminium ratios, respectively. The Predicted adsorption capacity for 2-NPh was estimated at 83.154 mg/g, aligning closely with the observed 82.02 mg/g, while the estimate for Cr3+ at 97.80 mg/g nearly matched the actual 96.57 mg/g. A validation study evaluated the predicted adsorption capacities for both contaminants, finding that the actual capacities were 86.79 mg/g for 2-NPh and 99.79 mg/g for Cr3+. The study noted an acceptable error margin in optimal adsorption capacity of about 4.5% for 2-NPh and 2% for Cr3+. The optimized integration of metal oxides with CNAs through impregnation significantly enhances their efficacy in removing pollutants, particularly when aluminium oxide is used to boost their capacity for purifying wastewater by extracting both organic and heavy metal contaminants.

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